<template>
  <div>
    <!-- 评论列表 -->
    <div class="cmt-list">
      <!-- 评论的 Item 项 -->
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad"
        :immediate-check='false'
        offset="50"
      >
        <div class="cmt-item" v-for="item in commentList" :key="item.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <img :src="item.aut_photo" alt="" class="avatar" />
              <span class="uname">{{ item.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                name="like"
                size="16"
                color="red"
                v-if="item.is_liking"
                @click="likeFn(false, item)"
              />
              <van-icon
                name="like-o"
                size="16"
                color="gray"
                v-else
                @click="likeFn(true, item)"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body">
            {{ item.content }}
          </div>
          <!-- 尾部区域 -->
          <div class="cmt-footer">{{ toDay(item.pubdate) }}</div>
        </div>
      </van-list>
    </div>

    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="show">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div" @click="pubComment">发表评论</div>
      <div class="icon-box" @click="svFn">
        <van-badge :content="n" max="99" >
          <van-icon name="comment-o" size="20" />
        </van-badge>
        <van-icon name="star-o" size="20" />
        <van-icon name="share-o" size="20" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div class="cmt-box van-hairline--top" v-else>
      <textarea
        placeholder="友善评论、理性发言、阳光心灵"
        @blur="blurFn"
        v-model="text"
        v-fofo
      ></textarea>
      <van-button
        type="default"
        :disabled="text.trim().length === 0"
        @click="pubFn"
        >发布</van-button
      >
    </div>
  </div>
</template>

<script>
import {
  getCommentListAPI,
  commentLikingAPI,
  commentDisLikingAPI,
  pubCommentAPI
} from '@/api'
import { toDay } from '../../directives/date' // 导入时间处理函数
export default {
  props: {
    articleObj: {
      type: Object,
      required: true
    }
  },
  async created () {
    this.getList()
  },
  data () {
    return {
      commentList: [],
      show: true, // 控制面板1的显示与否
      text: '', // 文本域中的内容
      last_id: null, // 用于分页的参数
      loading: false, // 用于控制加载状态
      finished: false, // 用于控制是否加载全部数据
      n: ''// 评论的总条数
    }
  },
  methods: {
    toDay,
    // 获取评论数据
    async getList () {
      // 发送获取评论列表请求
      const res = await getCommentListAPI({
        art_id: this.$route.params.id,
        offset: this.last_id
      })
      // 当请求数据长度为0 时,全部加载完毕
      if (res.data.data.results.length === 0) {
        this.finished = true
        return
      }
      // this.commentList = res.data.data.results
      this.commentList = [...this.commentList, ...res.data.data.results]
      this.n = res.data.data.total_count
      // 用于分页
      this.last_id = res.data.data.last_id
      // 加载状态改为false
      this.loading = false
    },
    async likeFn (bool, item) {
      if (bool) {
        // 点击喜欢事件----变成红心
        item.is_liking = true
        // 调用后台接口
        await commentLikingAPI({ com_id: item.com_id })
      } else {
        // 点击取消喜欢事件----变成灰心
        item.is_liking = false
        // 调用后台接口
        await commentDisLikingAPI({ id: item.com_id })
      }
    },
    onLoad () {
      this.getList()
    },
    // 点击评论,进入面板2
    pubComment () {
      // 面板1隐藏
      this.show = false
    },
    blurFn () {
      setTimeout(() => {
        this.show = true
      })
    },
    svFn () {
      // 让评论区域滚动到当前页面的最顶端
      // this.$nextTick(() => {
      document
        .querySelector('.like-box')
        .scrollIntoView({ behavior: 'smooth' })
      // })
    },
    // 点击发布,发布评论
    async pubFn () {
      // 后台接口
      const res = await pubCommentAPI({
        art_id: this.$route.params.id,
        content: this.text
      })
      // 前端 页面的变化
      this.commentList.unshift(res.data.data.new_obj)
      // 清空输入框
      this.text = ''
      // 让评论条数+1
      this.n++
    }
  }
}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
